it is not for normal human beings. it is for someone who is in coma or someone who is paralyzed. Won't you try this for them and give them a chance at life than leaving them on bed all the time ? That's why they run trails to see what all can go wrong and how to fix it. A small pacemaker is saving a lot of people and this has potential to give people a second chance of seeing , able to move and fixing you from inside. Plus it is Elon. as long as he is there , it will be good for the mankind.